Chapter 23. Screen Printing The process of forcing ink through a porous fabric (screen) and the...
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Transcript of Chapter 23. Screen Printing The process of forcing ink through a porous fabric (screen) and the...
SCREEN PRINTINGChapter 23
Screen Printing
The process of forcing ink through a porous fabric (screen) and the open areas of a stencil to produce an image
Serigraphy, mitograph, silk screen, stencil printing, screen process
Serigraphy- fine arts Screen Printing- graphic
communications
Screen Printing
Simple Process
Complex Process
Few inexpensive tools and materials
Array of sophisticated equipment and production techniqueso Complexity
o Level of quality required in finished piece
Applications
Posters, plastic bottles, drinking glasses, soda bottles, mirrors, metal surfaces, wood, textiles, printed circuit boards, product displays, vinyl binders, etc
Versatile Process
Advantages: wide variety of substrates, easy production process, low capital expenditures, decorative finishes, resilient ink film
Disadvantages: process is limited to flat, thin substrates, slow rate of production, poor ink mileage, excessive drying times, difficult to print details and fine line images
Screen Printing Process
Equipment: screen fabric, frame, stencil, ink, squeegee, substrate
1. Porous fabric is stretched across frame
2. Stencil is adhered to fabric blocking out portions and leaving open the desired image area
3. Ink is poured onto fabric and forced through image area using a squeegee
4. Ink is deposited on substrate, producing image of cut stencil
5. Multiple prints are created by repeating the process on new substrates
Photographic Stencils
Light sensitive Exposed using a positive film image Right-reading on emulsion side Indirect: exposed off the screen
fabric Direct: exposed after a light-sensitive
emulsion has been applied to screen frame
Direct-Indirect: combination of the two stencil techniques and materials
Diazo Emulsion Used with water-based or solvent-soluble inks Applied with scoop coater to both sides of screen Substrate side of emulsion should be smooth Exposure is made with a deep-bottom vacuum frame Positive is positioned on substrate side and should be
in contact with screen emulsion Exposure to light causes areas to harden and become
insoluble in water Unexposed area will be washed away Blockout can be applied to fill in pinholes and other
uncoated areas Emulsion is removed using a reclaiming solution
Screen Preparation
Screen Exposure
One Color Printing Process
Screen Clean Up
1. What are some typical applications of screen printing?
2. What are some advantages of screen printing?
3. What are some disadvantages of screen printing?
4. Describe the basic screen printing process.
5. When using a Diazo emulsion, how should the positive be positioned?
Review Questions